Lipo Battery Low Voltage Tester 1S-8S Buzzer Alarm

I checked the accuracy of this by comparing to the reading from a quality multimeter, it's actually spot on. Easy way to check battery voltage levels via the balance plug. Even 1s batteries can be checked by placing the prongs against the side of the ph2 connector. Alarm is set for 3.3V I think, but easy enough to change. I think I might buy several more, very handy.

Great for a quick visual of how the cells in your battery are performing. You can spot weak cells easily. Warns you if/when a cell drops below the ideal operating voltage.